/* ══════════════════════════════════════════════════════════════
   Longtee · AI Video Relay —— 首页样式
   概念：放映厅（黑场 + 胶片齿孔 + 片头字幕卡 + 暗房安全灯红）

   兼容约束（按 360 极速 / 老 Chromium 写）：
   · 不用 dvh / svh / lvh
   · 不用 CSS 嵌套 / :is() / :where() / aspect-ratio / backdrop-filter
   · 竖图比例用 padding-bottom 百分比撑，不用 aspect-ratio
   · 间距一律用 Grid gap（Chrome 57+），不用 flex gap
   · 字体走系统栈，不依赖任何 CDN
   ══════════════════════════════════════════════════════════════ */

:root {
  --void:   #08080a;
  --panel:  #101014;
  --panel2: #17171d;
  --panel3: #1e1e26;
  --line:   #26262f;
  --line2:  #37373f;
  --paper:  #f4f1ea;
  --txt:    #ece9e2;
  --txt2:   #9a968e;
  --txt3:   #6a6760;
  --safe:   #ff4a22;
  --safe-d: rgba(255, 74, 34, .13);
  --shot:   "Bahnschrift", "DIN Alternate", "PingFang SC", "HarmonyOS Sans SC",
            "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono:   "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  --maxw:   1220px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.rp {
  margin: 0;
  background: var(--void);
  color: var(--txt);
  font: 15px/1.75 "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC",
        "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

.rp a:focus-visible,
.rp button:focus-visible,
.rp video:focus-visible {
  outline: 2px solid var(--safe);
  outline-offset: 3px;
}

/* ── 按钮 ─────────────────────────────────────────────────── */
.rp-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--line2);
  border-radius: 2px;
  background: transparent;
  color: var(--txt);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  transition: background .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}
.rp-btn-solid { background: var(--safe); border-color: var(--safe); color: #140602; }
.rp-btn-solid:hover { background: #ff6a48; border-color: #ff6a48; transform: translateY(-2px); }
.rp-btn-line:hover { border-color: var(--safe); color: var(--safe); }
.rp-btn-ghost { border-color: transparent; color: var(--txt2); }
.rp-btn-ghost:hover { color: var(--txt); border-color: var(--line2); }
.rp-btn-lg { padding: 14px 28px; font-size: 15px; }

/* ── 顶栏 ─────────────────────────────────────────────────── */
.rp-top {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(8, 8, 10, .94);
  border-bottom: 1px solid var(--line);
}
.rp-top-in {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
  min-height: 68px;
}
.rp-brand { display: flex; align-items: center; gap: 11px; }
.rp-mark {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  background: var(--paper);
  color: var(--void);
  font: 700 17px/1 var(--shot);
  letter-spacing: .04em;
}
.rp-brand-txt { display: grid; }
.rp-brand-txt strong { font: 700 16px/1.2 var(--shot); letter-spacing: .06em; }
.rp-brand-txt small { color: var(--txt3); font-size: 11px; letter-spacing: .14em; }
.rp-nav { display: flex; justify-content: center; gap: 26px; }
.rp-nav a {
  color: var(--txt2);
  font-size: 14px;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color .18s, border-color .18s;
}
.rp-nav a:hover { color: var(--txt); border-bottom-color: var(--safe); }
.rp-top-acts { display: flex; align-items: center; gap: 10px; }

/* ── 区块骨架 ─────────────────────────────────────────────── */
.rp-hero,
.rp-gallery,
.rp-spec,
.rp-api {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}
.rp-kicker {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  color: var(--txt3);
  font: 600 11px/1 var(--mono);
  letter-spacing: .22em;
}
.rp-kicker i {
  width: 16px; height: 2px;
  background: var(--safe);
  display: block;
}
.rp-h1 {
  margin: 0 0 22px;
  font: 700 54px/1.16 var(--shot);
  letter-spacing: .01em;
}
.rp-h1 em { font-style: normal; color: var(--safe); }
.rp-h2 {
  margin: 0 0 12px;
  font: 700 32px/1.3 var(--shot);
  letter-spacing: .01em;
}
.rp-lead {
  margin: 0 0 30px;
  max-width: 520px;
  color: var(--txt2);
  font-size: 15.5px;
  line-height: 1.85;
}
.rp-sec-lead {
  margin: 0;
  max-width: 640px;
  color: var(--txt2);
  font-size: 14.5px;
}

/* ── 主视觉 ───────────────────────────────────────────────── */
.rp-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  align-items: center;
  gap: 60px;
  padding-top: 72px;
  padding-bottom: 88px;
}
.rp-hero-cta { display: grid; grid-auto-flow: column; justify-content: start; gap: 12px; margin-bottom: 42px; }

.rp-facts {
  list-style: none;
  margin: 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.rp-facts li { display: grid; gap: 4px; }
.rp-facts b {
  font: 700 27px/1 var(--shot);
  color: var(--paper);
  letter-spacing: .01em;
}
.rp-facts span { color: var(--txt3); font-size: 12px; letter-spacing: .06em; }

/* ── 签名元件：胶片条 ─────────────────────────────────────── */
.rp-strip { position: relative; padding: 30px 0; }
.rp-sprocket {
  position: absolute;
  left: 0; right: 0;
  height: 15px;
  background-image: repeating-linear-gradient(90deg,
      var(--line) 0 9px, transparent 9px 24px);
  opacity: .85;
}
.rp-sprocket-top { top: 0; }
.rp-sprocket-bottom { bottom: 0; }

.rp-strip-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  align-items: start;
}
.rp-cell {
  position: relative;
  margin: 0;
  padding-bottom: 355px;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
}
.rp-cell > video {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.rp-cell figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 26px 12px 11px;
  background: linear-gradient(to top, rgba(8, 8, 10, .92), rgba(8, 8, 10, 0));
  display: grid;
  gap: 2px;
}
.rp-cell figcaption b { font-size: 13px; font-weight: 700; }
.rp-cell figcaption span { color: var(--txt3); font: 11px/1.4 var(--mono); letter-spacing: .04em; }
.rp-cell-b { margin-top: 30px; border-color: var(--line2); }
.rp-cell-b > video { border: 0; }
.rp-cell-tag {
  position: absolute;
  top: 10px; left: 10px;
  padding: 3px 8px;
  background: var(--safe);
  color: #140602;
  font: 700 10px/1.5 var(--mono);
  letter-spacing: .1em;
}

/* ── 区块头 ───────────────────────────────────────────────── */
.rp-sec-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 32px;
  padding: 0 0 26px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}
.rp-filters { display: flex; gap: 8px; }
.rp-pill {
  padding: 8px 16px;
  border: 1px solid var(--line2);
  background: transparent;
  color: var(--txt2);
  font-size: 13px;
  cursor: pointer;
  transition: color .18s, border-color .18s, background .18s;
}
.rp-pill b { font: 600 11px/1 var(--mono); opacity: .7; margin-left: 4px; }
.rp-pill:hover { color: var(--txt); border-color: var(--txt3); }
.rp-pill.is-on { background: var(--safe-d); border-color: var(--safe); color: var(--safe); }

/* ── 成片墙 ───────────────────────────────────────────────── */
.rp-gallery { padding-top: 86px; padding-bottom: 96px; }
.rp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(196px, 1fr));
  gap: 16px;
}
.rp-card {
  position: relative;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  cursor: pointer;
  overflow: hidden;
  text-align: left;
  display: block;
  width: 100%;
  transition: border-color .2s ease, transform .2s ease;
}
.rp-card:hover { border-color: var(--line2); transform: translateY(-3px); }
.rp-card[hidden] { display: none; }
.rp-card-media {
  position: relative;
  padding-bottom: 150%;
  overflow: hidden;
  background: var(--panel2);
}
.rp-card-media img,
.rp-card-media video {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.rp-card-media video { opacity: 0; transition: opacity .25s ease; }
.rp-card:hover .rp-card-media video { opacity: 1; }
.rp-card-badge {
  position: absolute;
  top: 8px; right: 8px;
  padding: 3px 7px;
  background: rgba(8, 8, 10, .78);
  color: var(--txt2);
  font: 10px/1.6 var(--mono);
  letter-spacing: .06em;
}
.rp-card-foot {
  padding: 11px 12px 13px;
  display: grid;
  gap: 3px;
  border-top: 1px solid var(--line);
}
.rp-card-foot b { font-size: 13.5px; font-weight: 700; }
.rp-card-foot span { color: var(--txt3); font: 11px/1.5 var(--mono); letter-spacing: .03em; }
.rp-gallery-foot { margin: 24px 0 0; color: var(--txt3); font-size: 12.5px; }

/* ── 规格 ─────────────────────────────────────────────────── */
.rp-spec { padding-top: 20px; padding-bottom: 96px; }
.rp-spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
  gap: 16px;
}
.rp-spec-card {
  padding: 24px 22px 26px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.rp-spec-card h3 {
  margin: 0 0 18px;
  font: 700 12px/1 var(--mono);
  letter-spacing: .18em;
  color: var(--safe);
}
.rp-spec-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.rp-spec-list li { display: grid; gap: 2px; padding-bottom: 14px; border-bottom: 1px dashed var(--line); }
.rp-spec-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.rp-spec-list b { font-size: 14.5px; font-weight: 700; }
.rp-spec-list span { color: var(--txt3); font-size: 12.5px; }

/* ── API ──────────────────────────────────────────────────── */
.rp-api { padding-top: 20px; padding-bottom: 96px; }
.rp-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.rp-steps li {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 22px;
  padding: 24px 24px 26px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.rp-step-n {
  font: 700 30px/1 var(--shot);
  color: var(--line2);
  letter-spacing: .02em;
}
.rp-step-body h3 { margin: 0 0 14px; font-size: 16px; font-weight: 700; }
.rp-code {
  margin: 0;
  padding: 16px 18px;
  background: var(--void);
  border: 1px solid var(--line);
  overflow-x: auto;
  color: var(--txt);
  font: 12.5px/1.9 var(--mono);
  white-space: pre;
}
.rp-step-note { margin: 12px 0 0; color: var(--txt3); font-size: 12.5px; }
.rp-step-note code { color: var(--safe); font-family: var(--mono); }

/* ── CTA ──────────────────────────────────────────────────── */
.rp-cta {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(90deg,
      rgba(255, 255, 255, .035) 0 9px, transparent 9px 24px);
  background-size: 100% 15px;
  background-repeat: no-repeat;
  background-position: 0 0, 0 100%;
}
.rp-cta-in {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 78px 28px 82px;
  text-align: center;
}
.rp-kicker-light { justify-content: center; }
.rp-cta-h {
  margin: 0 0 16px;
  font: 700 38px/1.25 var(--shot);
}
.rp-cta-lead {
  margin: 0 auto 30px;
  max-width: 560px;
  color: var(--txt2);
  font-size: 15px;
}
.rp-cta-acts { display: grid; grid-auto-flow: column; justify-content: center; gap: 12px; }

/* ── 页脚 ─────────────────────────────────────────────────── */
.rp-foot { background: var(--void); border-top: 1px solid var(--line); }
.rp-foot-in {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  color: var(--txt3);
  font-size: 12.5px;
}
.rp-foot a { color: var(--txt2); }
.rp-foot a:hover { color: var(--safe); }
.rp-dot { margin: 0 10px; opacity: .5; }
.rp-grow { flex: 1 1 auto; }

/* ── 灯箱 ─────────────────────────────────────────────────── */
.rp-lb {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: 90;
  background: rgba(4, 4, 6, .93);
  display: grid;
  place-items: center;
  padding: 24px;
}
.rp-lb[hidden] { display: none; }
.rp-lb-box {
  position: relative;
  width: min(430px, 100%);
  background: var(--panel);
  border: 1px solid var(--line2);
  padding: 12px 12px 0;
}
.rp-lb-video { width: 100%; background: #000; }
.rp-lb-meta { padding: 13px 4px 16px; display: grid; gap: 3px; }
.rp-lb-meta strong { font-size: 15px; }
.rp-lb-meta span { color: var(--txt3); font: 11.5px/1.6 var(--mono); }
.rp-lb-close {
  position: absolute;
  top: -14px; right: -14px;
  width: 34px; height: 34px;
  border: 1px solid var(--line2);
  background: var(--panel2);
  color: var(--txt);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  z-index: 2;
}
.rp-lb-close:hover { border-color: var(--safe); color: var(--safe); }

/* ── 窄屏 ─────────────────────────────────────────────────── */
@media (max-width: 1040px) {
  .rp-hero { grid-template-columns: minmax(0, 1fr); gap: 44px; padding-top: 52px; }
  .rp-h1 { font-size: 42px; }
  .rp-cell { padding-bottom: 330px; }
}

@media (max-width: 760px) {
  .rp-top-in { grid-template-columns: auto 1fr; gap: 16px; padding: 0 18px; min-height: 60px; }
  .rp-nav { display: none; }
  .rp-top-acts { justify-self: end; }
  .rp-btn { padding: 8px 14px; font-size: 13px; }
  .rp-btn-lg { padding: 12px 20px; font-size: 14px; }
  .rp-hero, .rp-gallery, .rp-spec, .rp-api { padding-left: 18px; padding-right: 18px; }
  .rp-h1 { font-size: 33px; }
  .rp-h2 { font-size: 24px; }
  .rp-cta-h { font-size: 27px; }
  .rp-lead { font-size: 14.5px; }
  .rp-sec-head { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .rp-filters { flex-wrap: wrap; }
  .rp-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 14px; }
  .rp-facts b { font-size: 23px; }
  .rp-hero-cta, .rp-cta-acts { grid-auto-flow: row; justify-content: stretch; }
  .rp-hero-cta .rp-btn, .rp-cta-acts .rp-btn { justify-content: center; }
  .rp-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  /* 胶片条在窄屏改成横向滑动，三格并排会挤到看不清字幕 */
  .rp-strip-row {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: 58%;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 10px;
  }
  .rp-cell { scroll-snap-align: center; padding-bottom: 150%; }
  .rp-cell-b { margin-top: 0; }
  .rp-steps li { grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 20px 16px 22px; }
  .rp-step-n { font-size: 22px; }
  .rp-cta-in { padding: 58px 18px 62px; }
  .rp-foot-in { padding: 18px; }
  .rp-grow { flex-basis: 100%; height: 0; }
}

/* 极窄（<= 380） */
@media (max-width: 380px) {
  .rp-grid { grid-template-columns: minmax(0, 1fr); }
  .rp-strip-row { grid-auto-columns: 76%; }
}

/* ── 降级动效 ─────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}